dizzy when riding

07-07-2004, 07:39 PM

I've been cycling for the past 2 years about once or twice a week for
about 2 hours at a time, around 25 miles each trip. For about the
last 4 weeks I get really dizzy and slightly nauseated about 30
minutes into the ride and I have to stop and sit down for a while or I
feel like I'm going to get really sick. After about 15 minutes of
sitting down, standing doesn't help, I get slowly better and then I
seem to do ok no matter how hard or how far I ride after that.
Usually I eat a banana or two for breakfast with water. I've
sometimes had a honey bun with coffee and I've been dizzy with either
type of breakfast. I come home and check my BP and its about 125/75.
I've had some high BP in the past but never to a point the Dr. wanted
to put me on meds. After I began cycling 2 years ago the BP readings
have been consistently low. Could it be that while cycling my BP gets
too low? Or could it be getting too high during the ride, when I
can't check it? I've also been riding in the mornings when its
cooler. I live in Alabama and the summers are awful. 95 degrees with
90 percent humidity. I ride in the mornings when its about 75 degrees
and about 80 percent humidity. Could it be the high humidity? Other
riders wtih me, wife, brother in law, others do not experience the
same thing. I am 41 years old and slightly overweight, 205 lbs. 6 ft
2 inches tall. My ideal weight is about 185 - 190.

Any advice?